Theodoe davids



(No Model.) 2 Sheets-Sheet l.

T. DAVIDS. POLISHING APPARATUS PoR Woon, am., No. 385,171. Patented June 26, 1888.

IIIIHIIIIIIIIiIlIIII N IIHHIIIIIIIIIIIIIIIII 2 Sheets-Sheet 2.

(No Model.)

T. DAVIDS. POLISHING APPARATUS PoR W'oiolni.. Aw. No. 385,171.

Patented. June Z6, 188B.

N. PETERS. Pheto-Lilhagmphun washington. D4 C.

@Nieren STATES PATENT Ormes.

THEODOR DAVIDS, OF HANOVER, PRUSSIA, GERMANY.

POLISHING APPARATUS FOR WOOD, dac.`

SPECIFICATION forming pari; of Letters Patent No. 385,171, dated June 26, 1888.

Application led February Q, 1887. Serial No. 226,293. (No model.) Patented in Germany January 29, 1885, No. 32,299; in Austria-Hungary September-28,1885, No. 35,-2,and No..67,366; in Sweden October?, 1885, No. 313, and in Norway October13, 1885.

To @ZZ whom. it may concern-.f

Be it known that I, THEoDoR DAvIDs, a subject of the King of Prussia, German Empire, aresident of Hanover, Prussia, Germany, manufacturer, have invented a new and useful ImprovementinPolishingApparatusforWood and similar Materials, (for which I have obtained patents in Germany, No. 32,299, January 29, 1885; in Austria-Hungary, No. 35,462 and No. 67,366, SeptemberZS, 1885; in Sweden, No. 313, October 7, 1885, and in Norway October 13, 1885,) of which thc following is a specification.

These improvements relate to an apparatus for polishing smooth or grooved moldings of wood or other materials, and are characterized by the usc of a sledge moving to and fro and provided with a grinding-cloth. This grinding-cloth runs over two rollers, so that the attrito part of it may be removed from the grinding-surface and a new piece be rolled off the store-roller and brought under the grinding-surface of the carriage (sledge.)

The other improvements consist in the autr matical replacing ofthe attrite gri nding-cloth.

Figure l shows a side view of the apparatus with so much of the driving-machine as is necessary to illustrate the operation. Fig. 2 is a longitudinal section on the line A B of Fig. 3. Fig. 3 represents a cross-section on the line E F of Fig. 1, and Fig. 4 shows a cross-section on the line C D of Fig. l.

The apparatus P rests on a frame and moves to and fro in the guide y y. This to-and-fro motion is caused by the con nectiugrod a, fastened to the shaft 0 and driven by a machine. The shaft o rests on the bearings q, which are fastened to the apparatus P.

The apparatus P is on its lower side provided with the moldings n, between which is a wooden frame, o', that may be moved up and down, and fixed as desirable by means of Screws fr. Any desirable number of these wooden frames o can be placed beside and parallel to one another, the number of them being dependent on the size of the machine. In the accompanying drawingstwo frames, n', are represented. These wooden frames are provided with a filling-block, n2, which may be made of some elastic material.

The lower side of this filling-block o2 is shaped to correspond in its Y' able bearing, N, and is supported by the frame i Y, so that during the toand-fro motion of the grinding-cloth s with the filling-block o2 the molding is not liable to give way.

On the upper side of the apparatus are the following mechanisms: The store-rollers b b. on which the grinding-clotl1 s is rolled, and which may be of paper, leather, woven material, 85e., to which glass, emery, sand, &c., is applied in the well-known way. A small spring, d, pressing against the roller b, pren vents the grinding-cloth from winding off prematurely, and the grindingcloth is always kept stretched toward this side.

The grinding-cloth s runs from the roller b over the roller s', then along the filling-block o2 to the rollers si, and from the latter to the upper side of the sledge P. On this sledge P I provide the support t for the rollers w fw' and shaft wt. The attrite grinding-cloth runs between the rollers w w and is wound up on the roller 0r drum m.

There is further to be described the mechanism by which the attrite grinding-cloth is automatically wound up and the new grinding-cloth is conducted to the fillingblock o, This mechanism consists ef two cog-wheels, z and a', mounted rigidly on the projecting end of shaft or roller w' (see Figs.V 3 and 4) of the drums m m, mounted on shaft 102, resting in standardst t, and of two pawls, h h. Pawl his loosely guided in a slot of an arm, k, connecting pivot 0 of pawl h with said pawl h, that engages with cog-wheel z', serving as a check, as will be hereinafter more fully described. Pawl h is pivoted to rod a at o and gears into cog-wheel e. To the end of drumshaft w2 is secured a pulley, f', and to the end of friction roller or shaft w another pulley, f, being both connected by suitable belting. (Not shown in the drawings.)

The manner in which the attrite grindingcloth is wound upon drums m m is as follows:

IOO

During the forward and backward motion-of the apparatus P on frame y y' by means of connecting-rod a the latter oscillates round the fulerum o, for the other cud of the connectingrod is moved by the crank z' of the machine, which sets the polishing apparatus into motion, but which is not shown in the drawings. In consequence of this motion the pawl h", that gears by its gravityiuto cog-wheel z, will turn the latter when the apparatus P moves away from said cog-wheel; but it will again ascend and glide over one or more teeth on wheel z when the apparatus P approaches the cogwheel, as will be plainly understood by looking` at Fig. 1. rPhe pawl 7L that gears into its cog-wheel z alsol by its gravity will, since it reciprocates and oseillates in the slotted arm k during the forward and backward motion of apparatus P, only serve as a cheek and prevent any reverse motion of the axle w'. By this means the roller ai is turned and the grinding-cloth between 1v and w is transported by the friction between the rollers wand w. As already stated, the pulleyfis mounted on one end of the roller w, and is'connected bya belt with pullcyj" on the shaft 102. On this shaft are also mounted the drums m, and consequently the drums will also turn and wind np the worn-out grinding-cloth.

During the toand-fro motion of the appa- Aratus P the grindingcloth will polish the smooth or grooved molding L, which is kept in its proper posit-ion by means of the guide N. Theanoldng may be moved continuously or at intervals, so that always a fresh piece of the molding is subiected to the operation of the grindingcloth. The molding L moves of course inthe longitudinal direction of the ap paratus.

The hollow frame o must every time be fitted to the surface of the molding to be ground.

Vhat I claim, and desire to secure by Letters Patent of the United States, is-

l. The combination of the Sledge P aud means for moving it to and fro with the adjustable filling-block o2, the two grinding cloth rollers b and m, the grinding-cloth s, the spurwheel z', with pawl h on the connecting-rod o, the rollers w' w, and the strap-gear ff', for the purpose specified.

2. The combination of the sledge P and means for moving it to and fro with the adjustable lling-block v2, the adjusting screws r, the grinding-cloth rollers b and m, the guiderollers s s2, the transportingrollcrs w w, the transporting cog-wheel e', the pawl h ou the connecting-rod o, and the strap gear ff, substantially as described.

In witness whereofl have hereunto set my hand in presence of two witnesses.

THEODOR DAVIDS.`

Witnesses:

A. M. SIMON, JoHs. KRAOKE. 

